Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/tools/FinalizerInfo.java @ 3962:cb315dc80374
7092278: "jmap -finalizerinfo" throws "sun.jvm.hotspot.utilities.AssertionFailure: invalid cp index 0 137"
Reviewed-by: kvn
author | never |
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date | Thu, 29 Sep 2011 09:53:56 -0700 |
parents | 63997f575155 |
children | 38ea2efa32a7 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.tools; | |
26 | |
27 import sun.jvm.hotspot.tools.*; | |
28 | |
29 import sun.jvm.hotspot.oops.*; | |
30 import sun.jvm.hotspot.runtime.VM; | |
31 import sun.jvm.hotspot.utilities.SystemDictionaryHelper; | |
32 import sun.jvm.hotspot.utilities.ObjectReader; | |
33 import sun.jvm.hotspot.utilities.MarkBits; | |
34 | |
35 import java.util.HashMap; | |
36 import java.util.ArrayList; | |
37 import java.util.Collections; | |
38 import java.util.Comparator; | |
39 | |
40 /* | |
41 * Iterates over the queue of object pending finalization and prints a | |
42 * summary of these objects in the form of a histogram. | |
43 */ | |
44 public class FinalizerInfo extends Tool { | |
45 public static void main(String[] args) { | |
46 FinalizerInfo finfo = new FinalizerInfo(); | |
47 finfo.start(args); | |
48 finfo.stop(); | |
49 } | |
50 | |
51 public void run() { | |
52 /* | |
53 * The implementation here has a dependency on the implementation of | |
54 * java.lang.ref.Finalizer. If the Finalizer implementation changes it's | |
55 * possible this method will require changes too. We looked into using | |
56 * ObjectReader to deserialize the objects from the target VM but as | |
57 * there aren't any public methods to traverse the queue it means using | |
58 * reflection which will also tie us to the implementation. | |
59 * | |
60 * The assumption here is that Finalizer.queue is the ReferenceQueue | |
61 * with the objects awaiting finalization. The ReferenceQueue queueLength | |
62 * is the number of objects in the queue, and 'head' is the head of the | |
63 * queue. | |
64 */ | |
65 InstanceKlass ik = | |
66 SystemDictionaryHelper.findInstanceKlass("java.lang.ref.Finalizer"); | |
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67 final Oop[] queueref = new Oop[1]; |
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68 ik.iterateStaticFields(new DefaultOopVisitor() { |
0 | 69 public void doOop(OopField field, boolean isVMField) { |
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70 String name = field.getID().getName(); |
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71 if (name.equals("queue")) { |
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72 queueref[0] = field.getValue(getObj()); |
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73 } |
0 | 74 } |
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75 }); |
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76 Oop queue = queueref[0]; |
0 | 77 |
78 InstanceKlass k = (InstanceKlass) queue.getKlass(); | |
79 | |
80 LongField queueLengthField = (LongField) k.findField("queueLength", "J"); | |
81 long queueLength = queueLengthField.getValue(queue); | |
82 | |
83 OopField headField = (OopField) k.findField("head", "Ljava/lang/ref/Reference;"); | |
84 Oop head = headField.getValue(queue); | |
85 | |
86 System.out.println("Number of objects pending for finalization: " + queueLength); | |
87 | |
88 /* | |
89 * If 'head' is non-NULL then it is the head of a list of References. | |
90 * We iterate over the list (end of list is when head.next == head) | |
91 */ | |
92 if (head != null) { | |
93 k = (InstanceKlass) head.getKlass(); | |
94 OopField referentField = | |
95 (OopField) k.findField("referent", "Ljava/lang/Object;"); | |
96 OopField nextField = | |
97 (OopField) k.findField("next", "Ljava/lang/ref/Reference;"); | |
98 | |
99 HashMap map = new HashMap(); | |
100 for (;;) { | |
101 Oop referent = referentField.getValue(head); | |
102 | |
103 Klass klass = referent.getKlass(); | |
104 if (!map.containsKey(klass)) { | |
105 map.put(klass, new ObjectHistogramElement(klass)); | |
106 } | |
107 ((ObjectHistogramElement)map.get(klass)).updateWith(referent); | |
108 | |
109 Oop next = nextField.getValue(head); | |
110 if (next == null || next.equals(head)) break; | |
111 head = next; | |
112 } | |
113 | |
114 /* | |
115 * Sort results - decending order by total size | |
116 */ | |
117 ArrayList list = new ArrayList(); | |
118 list.addAll(map.values()); | |
119 Collections.sort(list, new Comparator() { | |
120 public int compare(Object o1, Object o2) { | |
121 return ((ObjectHistogramElement)o1).compare((ObjectHistogramElement)o2); | |
122 } | |
123 }); | |
124 | |
125 /* | |
126 * Print summary of objects in queue | |
127 */ | |
128 System.out.println(""); | |
129 System.out.println("Count" + "\t" + "Class description"); | |
130 System.out.println("-------------------------------------------------------"); | |
131 for (int i=0; i<list.size(); i++) { | |
132 ObjectHistogramElement e = (ObjectHistogramElement)list.get(i); | |
133 System.out.println(e.getCount() + "\t" + e.getDescription()); | |
134 } | |
135 } | |
136 | |
137 } | |
138 } |